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path: root/drivers/regulator/mc13xxx-regulator-core.c
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-rw-r--r--drivers/regulator/mc13xxx-regulator-core.c220
1 files changed, 220 insertions, 0 deletions
diff --git a/drivers/regulator/mc13xxx-regulator-core.c b/drivers/regulator/mc13xxx-regulator-core.c
new file mode 100644
index 000000000..8ff19150c
--- /dev/null
+++ b/drivers/regulator/mc13xxx-regulator-core.c
@@ -0,0 +1,220 @@
+// SPDX-License-Identifier: GPL-2.0
+//
+// Regulator Driver for Freescale MC13xxx PMIC
+//
+// Copyright 2010 Yong Shen <yong.shen@linaro.org>
+//
+// Based on mc13783 regulator driver :
+// Copyright (C) 2008 Sascha Hauer, Pengutronix <s.hauer@pengutronix.de>
+// Copyright 2009 Alberto Panizzo <maramaopercheseimorto@gmail.com>
+//
+// Regs infos taken from mc13xxx drivers from freescale and mc13xxx.pdf file
+// from freescale
+
+#include <linux/mfd/mc13xxx.h>
+#include <linux/regulator/machine.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/of_regulator.h>
+#include <linux/platform_device.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/err.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include "mc13xxx.h"
+
+static int mc13xxx_regulator_enable(struct regulator_dev *rdev)
+{
+ struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
+ struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;
+ int id = rdev_get_id(rdev);
+
+ dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id);
+
+ return mc13xxx_reg_rmw(priv->mc13xxx, mc13xxx_regulators[id].reg,
+ mc13xxx_regulators[id].enable_bit,
+ mc13xxx_regulators[id].enable_bit);
+}
+
+static int mc13xxx_regulator_disable(struct regulator_dev *rdev)
+{
+ struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
+ struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;
+ int id = rdev_get_id(rdev);
+
+ dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id);
+
+ return mc13xxx_reg_rmw(priv->mc13xxx, mc13xxx_regulators[id].reg,
+ mc13xxx_regulators[id].enable_bit, 0);
+}
+
+static int mc13xxx_regulator_is_enabled(struct regulator_dev *rdev)
+{
+ struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
+ struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;
+ int ret, id = rdev_get_id(rdev);
+ unsigned int val;
+
+ ret = mc13xxx_reg_read(priv->mc13xxx, mc13xxx_regulators[id].reg, &val);
+ if (ret)
+ return ret;
+
+ return (val & mc13xxx_regulators[id].enable_bit) != 0;
+}
+
+static int mc13xxx_regulator_set_voltage_sel(struct regulator_dev *rdev,
+ unsigned selector)
+{
+ struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
+ struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;
+ int id = rdev_get_id(rdev);
+
+ return mc13xxx_reg_rmw(priv->mc13xxx, mc13xxx_regulators[id].vsel_reg,
+ mc13xxx_regulators[id].vsel_mask,
+ selector << mc13xxx_regulators[id].vsel_shift);
+}
+
+static int mc13xxx_regulator_get_voltage(struct regulator_dev *rdev)
+{
+ struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
+ struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;
+ int ret, id = rdev_get_id(rdev);
+ unsigned int val;
+
+ dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id);
+
+ ret = mc13xxx_reg_read(priv->mc13xxx,
+ mc13xxx_regulators[id].vsel_reg, &val);
+ if (ret)
+ return ret;
+
+ val = (val & mc13xxx_regulators[id].vsel_mask)
+ >> mc13xxx_regulators[id].vsel_shift;
+
+ dev_dbg(rdev_get_dev(rdev), "%s id: %d val: %d\n", __func__, id, val);
+
+ BUG_ON(val >= mc13xxx_regulators[id].desc.n_voltages);
+
+ return rdev->desc->volt_table[val];
+}
+
+const struct regulator_ops mc13xxx_regulator_ops = {
+ .enable = mc13xxx_regulator_enable,
+ .disable = mc13xxx_regulator_disable,
+ .is_enabled = mc13xxx_regulator_is_enabled,
+ .list_voltage = regulator_list_voltage_table,
+ .set_voltage_sel = mc13xxx_regulator_set_voltage_sel,
+ .get_voltage = mc13xxx_regulator_get_voltage,
+};
+EXPORT_SYMBOL_GPL(mc13xxx_regulator_ops);
+
+int mc13xxx_fixed_regulator_set_voltage(struct regulator_dev *rdev, int min_uV,
+ int max_uV, unsigned *selector)
+{
+ int id = rdev_get_id(rdev);
+
+ dev_dbg(rdev_get_dev(rdev), "%s id: %d min_uV: %d max_uV: %d\n",
+ __func__, id, min_uV, max_uV);
+
+ if (min_uV <= rdev->desc->volt_table[0] &&
+ rdev->desc->volt_table[0] <= max_uV) {
+ *selector = 0;
+ return 0;
+ } else {
+ return -EINVAL;
+ }
+}
+EXPORT_SYMBOL_GPL(mc13xxx_fixed_regulator_set_voltage);
+
+const struct regulator_ops mc13xxx_fixed_regulator_ops = {
+ .enable = mc13xxx_regulator_enable,
+ .disable = mc13xxx_regulator_disable,
+ .is_enabled = mc13xxx_regulator_is_enabled,
+ .list_voltage = regulator_list_voltage_table,
+ .set_voltage = mc13xxx_fixed_regulator_set_voltage,
+};
+EXPORT_SYMBOL_GPL(mc13xxx_fixed_regulator_ops);
+
+#ifdef CONFIG_OF
+int mc13xxx_get_num_regulators_dt(struct platform_device *pdev)
+{
+ struct device_node *parent;
+ int num;
+
+ if (!pdev->dev.parent->of_node)
+ return -ENODEV;
+
+ parent = of_get_child_by_name(pdev->dev.parent->of_node, "regulators");
+ if (!parent)
+ return -ENODEV;
+
+ num = of_get_child_count(parent);
+ of_node_put(parent);
+ return num;
+}
+EXPORT_SYMBOL_GPL(mc13xxx_get_num_regulators_dt);
+
+struct mc13xxx_regulator_init_data *mc13xxx_parse_regulators_dt(
+ struct platform_device *pdev, struct mc13xxx_regulator *regulators,
+ int num_regulators)
+{
+ struct mc13xxx_regulator_priv *priv = platform_get_drvdata(pdev);
+ struct mc13xxx_regulator_init_data *data, *p;
+ struct device_node *parent, *child;
+ int i, parsed = 0;
+
+ if (!pdev->dev.parent->of_node)
+ return NULL;
+
+ parent = of_get_child_by_name(pdev->dev.parent->of_node, "regulators");
+ if (!parent)
+ return NULL;
+
+ data = devm_kcalloc(&pdev->dev, priv->num_regulators, sizeof(*data),
+ GFP_KERNEL);
+ if (!data) {
+ of_node_put(parent);
+ return NULL;
+ }
+
+ p = data;
+
+ for_each_child_of_node(parent, child) {
+ int found = 0;
+
+ for (i = 0; i < num_regulators; i++) {
+ if (!regulators[i].desc.name)
+ continue;
+ if (of_node_name_eq(child,
+ regulators[i].desc.name)) {
+ p->id = i;
+ p->init_data = of_get_regulator_init_data(
+ &pdev->dev, child,
+ &regulators[i].desc);
+ p->node = child;
+ p++;
+
+ parsed++;
+ found = 1;
+ break;
+ }
+ }
+
+ if (!found)
+ dev_warn(&pdev->dev,
+ "Unknown regulator: %pOFn\n", child);
+ }
+ of_node_put(parent);
+
+ priv->num_regulators = parsed;
+
+ return data;
+}
+EXPORT_SYMBOL_GPL(mc13xxx_parse_regulators_dt);
+#endif
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Yong Shen <yong.shen@linaro.org>");
+MODULE_DESCRIPTION("Regulator Driver for Freescale MC13xxx PMIC");
+MODULE_ALIAS("mc13xxx-regulator-core");